Oceans and Water Quality

Most of the oxygen in Earth’s atmosphere is produced in the top six

inches of the oceans. Which best explains this?

• Oxygen is produced as a by-product as fish breathe through their gills.

• Oxygen is produced by seawater, which evaporates into pure oxygen and hydrogen.

• Oxygen is produced by deepwater plants and is then moved to the surface of the ocean.

• Oxygen is produced by photosynthetic microorganisms that live near the surface of the ocean.

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Which characteristic of an estuary makes it a good nursery area for marine organisms?

• It is located at the mouth of a river

• It has a mix of salt and fresh water.

• It has many areas to hide from predators.

• It has the ability to absorb water and prevent flooding.

Which factors limit the productivity of a marine ecosystem?

• availability of light and nutrient

• availability of nutrients and fresh water

• availability of light and chemosynthetic organisms

• availability of photosynthetic organisms and fresh water

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Which property must submersibles and ROVs (remotely operated vehicles) share?

• They should be able to emerge quickly.

• They should be able to employ robotic arms.

• They must be able to transport several scuba divers.

• They must be able to withstand extreme water pressures

Which best explains the importance of estuaries?

• Estuaries are freshwater areas that support a large amount of living things.

• Estuaries are areas where freshwater and salt water collide, resulting in a large amount of biodiversity.

• Estuaries are tropical areas that support an abundance of life found usually in cold regions of the ocean.

• Estuaries are nutrient-rich areas because they have large amounts of carbon dioxide seeping into the water from the ground below.

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In which oceanic zone do clams and crabs survive by burrowing in the sand?

• oceanic

• intertidal

• deep ocean

• open ocean

What causes upwelling in the oceans?

• coral reef construction

• coral reef construction

• winds and ocean currents

• animal migration patterns

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How is the amount of oxygen in ocean water affected by temperature?

• The amount of oxygen in ocean water increases as temperature increases

• The amount of oxygen in ocean water increases as temperature decreases.

• The amount of oxygen in ocean water decreases as temperature decreases

• The amount of oxygen in ocean water is kept constant as temperature decreases.

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Which best describes the water found in estuaries?

• brackish

• salt water

• freshwater

Which organism is at the base of a marine food web?

• crab

• phytoplankton

• whale

• zooplankton

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